A) Argue that the energy stored in the electric field of such a capacitor is Ufield=1/2CVo2, if Vo is the potential difference. (Hint: Argue that between the plates, the field strength is EVo/d, where dRo -RI is the distance between the conductors. Use the equation for the capacitance of a nested sell capacitor and the fact that Ro  Ri, to eliminate d in the equation for E in favor of C. Roughly how much volume does this field occupy?)
b) Imagine we discharge this capacitor by connecting its plates with a wire of resistance R. The rate at which thermal energy is produced in the wire at any given instant of time is..
refer to attachment
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My solution is attached in two identical files, so you can choose your favorite format. One is in MS ...
Going from basic definitions and using integration this solution calculates the electrostatic energy stored in a nested concentric spherical capacitor.